removing xinerama on X11 dependency, this wasn't working very usefully.

CMakeLists.txt

@@ -166,7 +166,6 @@ unset(PLATFORM_DEFAULT)
 
 if(UNIX AND NOT APPLE)
 	option(WITH_X11_XINPUT "Enable X11 Xinput (tablet support and unicode input)"	ON)
-	option(WITH_X11_XINERAMA "Enable multi-monitor support"	ON)
 	option(WITH_X11_XF86VMODE "Enable X11 video mode switching"	ON)
 	option(WITH_SYSTEM_GLEW "Use GLEW OpenGL wrapper library provided by the operating system" ON)
 
@@ -431,7 +430,6 @@ if(WITH_GHOST_SDL OR WITH_HEADLESS)
 	set(WITH_GHOST_XDND OFF)
 	set(WITH_X11_XF86VMODE OFF)
 	set(WITH_X11_XINPUT OFF)
-	set(WITH_X11_XINERAMA OFF)
 endif()
 
 if(MINGW)
@@ -822,14 +820,6 @@ if(UNIX AND NOT APPLE)
 			endif()
 		endif()
 
-		if(WITH_X11_XINERAMA)
-			if(X11_Xinerama_LIB)
-				set(PLATFORM_LINKLIBS "${PLATFORM_LINKLIBS} ${X11_Xinerama_LIB}")
-			else()
-				set(WITH_X11_XINERAMA OFF)
-			endif()
-		endif()
-
 		if(WITH_X11_XF86VMODE)
 			# XXX, why dont cmake make this available?
 			FIND_LIBRARY(X11_Xxf86vmode_LIB Xxf86vm   ${X11_LIB_SEARCH_PATH})
@@ -2162,7 +2152,6 @@ if(FIRST_RUN)
 	info_cfg_option(WITH_INSTALL_PORTABLE)
 	info_cfg_option(WITH_X11_XF86VMODE)
 	info_cfg_option(WITH_X11_XINPUT)
-	info_cfg_option(WITH_X11_XINERAMA)
 	info_cfg_option(WITH_MEM_JEMALLOC)
 	info_cfg_option(WITH_SYSTEM_GLEW)
 	info_cfg_option(WITH_SYSTEM_OPENJPEG)